The seasonality and behaviour of tabanids were studied in the Planalto Serrano of Santa Catarina State, Brazil. From March 2007 to February 2009, a total of 915 tabanid flies from 15 species and six genera were collected on an individual horse. The number of tabanid species varied from zero during autumn/winter to ten in summer (December–February). Dichelacera alcicornis Wied. (62.1%) was the most abundant species followed by Chrysops fusciapex Lutz (6.7%) and C. patricia Pechuman (5.9%). Peak catches occurred during the summer (December–March). The landing behaviour varied by genera: Chrysops (100%) preferred the head, Dichelacera (56.3%) the flanks, and Poecilodera (100%), Acanthocera (100%), Tabanus (58.8%) and Fidena (48.7%) the limbs region. This is the first work on tabanids in the Santa Catarina State, Brazil.
